google/adk-recipes ? reverse-engineered prompt

Build me a public Python repo for a collection of Agent Development Kit recipes that people can fork and use as starting points.

I want it to feel like a real project that shows a few small runnable agent examples, some core patterns like login flows, memory, guardrails, and retrieval, plus a place for community contributed vertical agents and installable skill plugins. Please include clear README files that explain what each recipe does, how to run it, and where to start if someone wants to customize it for their own app.

Set it up so the repo is easy to navigate, with separate areas for core examples, contributed solutions, and plugins. Add the basic project files, contribution guidance, and any supporting docs a new contributor would expect. If you need to check current ADK docs or best practices online, go ahead and look them up. Make it polished enough that someone browsing the repo can immediately understand how to try a recipe and reuse the pattern in their own project.